1. Strengthen the feeding and management of empty sows. Add protein feed and energy feed 3 to 14 days before seeding, and add minerals and vitamins at the same time to make it enter into the best state of breeding sooner; to empty sows with poor lyricism, 6 breeding methods can be used for superior feeding, that is, to strengthen the nutrition for a relatively long period of time before mating, so that it can restore the sensation and strength as much as possible to facilitate breeding, abortion, and miscarriage, and increase the litter size.
2. The mating time of the timely mating sows is best from 22 to 24 hours after the onset of oestrus. From the perspective of oestrus, the sows are switched from extreme excitement to quieter, white silky mucus from the vagina, and sow on hand. When the gilt sow stays still, breeding is best, so that the mortality of the embryo is low and the farrowing rate is high.
3. Endocrine regulation Within 7 days after mating, 30 mg of progesterone is injected into each sow, which can effectively reduce embryonic death and prevent sow fetalization.
4. Improve feed quality Sows during pregnancy, feed quality is better, to prevent the use of mildew, pollution, frozen feed sows, otherwise prone to food or pesticide poisoning, light can cause embryo toxicity death, in serious cases affect the sow Life safety.
5. Controlling the ambient temperature In the first week of pregnancy, when the ambient temperature is as high as 32-35°C for a short time (24 hours), the embryonic death increases; similarly, if the boar is bred with a heated boar, embryo death can also be caused. Therefore, it is best to control the ambient temperature between 15 and 25 °C.
In addition, it is necessary to prevent and cure a series of reproductive system diseases in a timely manner.
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